Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
MySQL Articles
Page 155 of 355
MySQL query to fetch records before currentdate + 2 weeks?
For this, use the below syntax −select * from yourTableName where yourColumnName < DATE_ADD(CURDATE(), INTERVAL 2 WEEK);Note: The current date is as follows −mysql> select curdate(); +------------+ | curdate() | +------------+ | 2019-10-20 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable1607 -> ( -> ShippingDate date -> ) -> ; Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1607 values('2019-10-20'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1607 values('2019-11-04'); Query OK, 1 row affected ...
Read MoreImplement Harmonic mean and Quadratic mean in MySQL?
Let us first create a table −mysql> create table DemoTable1606 -> ( -> Value int -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1606 values(5); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1606 values(10); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select * from DemoTable1606;This will produce the following output −+-------+ | Value | +-------+ | 5 | | 10 | +-------+ 2 rows in set (0.00 sec)Here is the ...
Read MoreMySQL update column to NULL for blank values
For this, you can use IF() along with UPDATE command. Let us first create a table −mysql> create table DemoTable1601 -> ( -> FirstName varchar(20) , -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1601 values('John', 'Doe'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1601 values('Adam', ''); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1601 values('David', 'Miller'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1601 values('Chris', ''); Query OK, 1 row affected ...
Read MoreUsing UNIQUE for varchar columns with some conditions in MySQL?
For this, you can use UNIQUE constraint on one or more columns −alter table yourTablleName add unique(yourColumnName1, yourColumnName2, ...N);Let us first create a table −mysql> create table DemoTable1598 -> ( -> EmployeeId int, -> EmployeeName varchar(20), -> EmployeeCountryName varchar(20) -> ); Query OK, 0 rows affected (0.52 sec)Here is the query to implement UNIQUE on varchar columns −mysql> alter table DemoTable1598 add unique(EmployeeName, EmployeeCountryName); Query OK, 0 rows affected (0.55 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable1598 values(101, 'Adam', 'AUS'); Query OK, 1 ...
Read MoreFix ERROR 1093 (HY000): You can't specify target table for update in FROM clause while deleting the lowest value from a MySQL column?
Let us first create a table −mysql> create table DemoTable1597 -> ( -> Marks int -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1597 values(45); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1597 values(59); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable1597 values(43); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1597 values(85); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1597 values(89); Query OK, 1 row affected (0.12 sec)Display all records from the table ...
Read MoreCan we use "rank" as column name with MySQL8?
The rank is a MySQL reserved word defined in MySQL version 8.0.2. Therefore, you cannot use rank as a column name. You need to use backticks around the rank.Let us first check the MySQL version we are working on. Here, I am using MySQL version 8.0.12 −mysql> select version(); +-----------+ | version() | +-----------+ | 8.0.12 | +-----------+ 1 row in set (0.00 sec)The issues by using “rank” as column name are as follows −mysql> create table DemoTable1596 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> rank int ...
Read MoreMySQL RegExp to fetch records with only a specific number of words
For this, use Regular Expression in MySQL as in the below syntax −select * from yourTableName where yourColumnName regexp '\land[\land ]+[ ]+[\land ]+$';The above query will work when the two words are separated by a space. Let us first create a table −mysql> create table DemoTable1412 -> ( -> Name varchar(40) -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1412 values('John Adam Carol'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1412 values('Mike Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert ...
Read MoreCall Stored Procedures within a Stored Procedure with IF Logic?
To call stored procedures within a stored procedure, the syntax is as follows −If yourInputValue > 100 then call yourProcedureName1(); else call yourProcedureName2(); end If ; ENDLet us implement the above syntax. In order to implement the above concept, let us create a stored procedure −mysql> delimiter // mysql> create procedure Hello_Stored_Procedure() -> BEGIN -> select 'Hello World!!!'; -> END -> // Query OK, 0 rows affected (0.18 sec)The query to create the second stored procedure is as follows −mysql> create procedure Hi_Stored_Procedure() -> BEGIN -> ...
Read MoreAlternative to MySQL CASE WHEN in MySQL
Use IF() method as an alternative to CASE WHEN in MySQL. Let us first create a table −mysql> create table DemoTable1593 -> ( -> PlayerScore int -> ); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1593 values(78); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1593 values(0); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1593 values(89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1593 values(0); Query OK, 1 row affected (0.16 sec)Display all records from the table using ...
Read MoreHow to convert varchar "time" to real time in MySQL?
For this, you can use TIME_FORMAT(). Let us first create a table −mysql> create table DemoTable1591 -> ( -> ArrivalTime varchar(20) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1591 values('1620'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1591 values('2345'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1591 values('2210'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select * from DemoTable1591;This will produce the following output −+-------------+ | ArrivalTime | +-------------+ ...
Read More